CN110791193A

CN110791193A - Water-based bi-component bright white paint with excellent comprehensive performance and preparation method thereof

Info

Publication number: CN110791193A
Application number: CN201911127022.3A
Authority: CN
Inventors: 马强华; 邓文根
Original assignee: Shanghai Junzilan New Materials Co Ltd
Current assignee: Shanghai Junzilan New Materials Co Ltd
Priority date: 2019-11-18
Filing date: 2019-11-18
Publication date: 2020-02-14

Abstract

The invention relates to the technical field of coating compositions, in particular to a water-based two-component bright white paint with excellent comprehensive performance and a preparation method thereof. An aqueous bi-component bright white paint with excellent comprehensive performance is prepared from (2.5-4) by weight: 1, wherein the component A comprises the following raw materials in parts by weight: 50-60 parts of aqueous hydroxyl acrylic emulsion, 5-15 parts of water, 25-35 parts of titanium white slurry, 1-5 parts of high-density polyethylene wax emulsion, 1-3 parts of auxiliary agent, 0.1-0.2 part of ammonia neutralizer, 2-5 parts of dipropylene glycol butyl ether, 0.05-0.1 part of in-tank bactericide and 0.1-2 parts of thickening agent; the hydroxyl value of the water-based hydroxyl acrylate emulsion is 2.5-3.5, and the solid content is 60-80%; the component B is water-based silicon-based aliphatic polyisocyanate.

Description

Water-based bi-component bright white paint with excellent comprehensive performance and preparation method thereof

Technical Field

The invention belongs to the technical field of coating compositions, and particularly relates to a water-based two-component bright white paint with excellent comprehensive performance and a preparation method thereof.

Background

Along with the continuous improvement of the material level and the cultural living standard of people, the quality of living environment and home furnishing of people is higher and higher, and the surface effect of various furniture in various shapes and colors is the standard for selecting furniture and the criterion for judging the paint coating effect on the surface of the furniture. Although the existing solvent-based two-component polyurethane coating has excellent physical and mechanical properties, chemical resistance and other properties, the coating contains organic solvent, so that the coating is volatile, smells strong and toxic, and can cause air pollution in the production and use processes. With the successive departure of the volatile organic compound control plan, the solvent type polyurethane coating inevitably faces transformation and upgrading.

The water-based paint takes water as a dispersion medium, so that the emission of harmful air pollutants and volatile organic compounds is reduced to a great extent, and the water-based paint becomes a hotspot and development direction of future research of the paint. However, at present, because the crosslinking density of a coating film formed by the single-component water-based paint is not high, the final hardness of the coating film is not enough, the scratch resistance and the chemical corrosion resistance are general, the sealing effect is not ideal enough, and the bottleneck of the performance is difficult to break through; the existing developed water-based double-component high-gloss white paint has the problems of low gloss, insufficient hardness, serious indentation during packaging and the like, and the defects of the product quality greatly restrict the popularization of the healthy and environment-friendly water-based high-gloss white paint and greatly reduce the utilization rate of the water-based paint. In order to meet the market requirements, the development of a double-component water-based bright white paint with better performance is urgently needed to improve the coating selection of woodware such as furniture and the like.

Disclosure of Invention

In order to solve the above problems, the first aspect of the present invention provides a water-based two-component bright white paint with excellent overall performance, which is prepared from (2.5-4): 1, wherein the component A comprises the following raw materials in parts by weight: 50-60 parts of aqueous hydroxyl acrylic emulsion, 5-15 parts of water, 25-35 parts of titanium white slurry, 1-5 parts of high-density polyethylene wax emulsion, 1-3 parts of auxiliary agent, 0.1-0.2 part of ammonia neutralizer, 2-5 parts of dipropylene glycol butyl ether, 0.05-0.1 part of in-tank bactericide and 0.1-2 parts of thickening agent; the hydroxyl value of the water-based hydroxyl acrylate emulsion is 2.5-3.5, and the solid content is 60-80%; the component B is water-based silicon-based aliphatic polyisocyanate.

As a preferable technical scheme, the raw materials for preparing the waterborne silicon-based aliphatic polyisocyanate comprise a hydrophilic modifier, aliphatic polyisocyanate and organosilicon.

As a preferred technical scheme, the hydrophilic modifier is selected from one or more of 3- (cyclohexylamine) -1-propanesulfonic acid, 2-cyclohexylamine ethanesulfonic acid, N- (3-triethoxysilylpropyl) -4-hydroxybutyramide and N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid sodium salt.

As a preferred technical scheme, the aliphatic polyisocyanate is selected from one or more of isophorone diisocyanate, 1, 6-hexamethylene diisocyanate, hexamethylene diisocyanate and dicyclohexyl methane-4, 4' -diisocyanate.

As a preferable technical scheme, the hydroxyl value of the aqueous hydroxyl acrylate emulsion is 3.0, and the solid content is 70%.

As a preferable technical scheme, the mass percent of the rutile type titanium dioxide in the titanium dioxide slurry is 65-75%.

As a preferred technical scheme, the auxiliary agent consists of a defoaming agent, a wetting agent, a dispersing agent and a flatting agent; the auxiliary agent comprises the following components in percentage by weight: 23-30% of defoaming agent, 18-28% of wetting agent, 13-25% of dispersing agent and the balance of leveling agent.

As a preferable technical scheme, the defoaming agent is one or more of an aqueous non-silicone fatty acid polymer, a modified polyacrylic acid polymer, polyoxyethylene ether and modified polysiloxane; the dispersant is a copolymer and/or a high molecular block copolymer containing pigment affinity groups; the leveling agent is polyether modified polysiloxane and/or polyester modified polysiloxane.

The second aspect of the present invention provides a method for preparing the aqueous two-component bright white paint with excellent comprehensive properties, which comprises the following steps:

s1 preparation of component A: dispersing the aqueous hydroxyl acrylic emulsion and the auxiliary agent at the rotation speed of 1200-1500rpm until the fineness is less than or equal to 25 mu m, then adding dipropylene glycol butyl ether mixed with water in advance, adding titanium white slurry, in-tank bactericide, high-density polyethylene wax emulsion and thickening agent, and uniformly stirring to obtain a component A;

s2 preparation of component B: firstly, reacting a hydrophilic modifier with organic silicon at 60-80 ℃ to obtain a hydrophilic silicon-based modifier; and then, reacting the hydrophilic silicon-based modifier with aliphatic polyisocyanate for 1.5 to 3.5 hours at the temperature of between 60 and 100 ℃, cooling and discharging to obtain the component B.

The third aspect of the invention provides a method for using the water-based two-component bright white paint with excellent comprehensive performance, which comprises the following steps: stirring and emulsifying the component B and water, adding the emulsified component B into the component A, stirring uniformly, curing for 5-10min, and coating the mixture on a workpiece.

Has the advantages that: the water-based bi-component bright white paint has the advantages of high crosslinking density, high hardness, quick drying, good storage stability and corrosion resistance, quick leveling after spraying, full and hard paint film, smoothness and brightness, uniform luster, excellent gloss and color retention and fine and smooth hand feeling after drying, and the workability and water resistance of the product are correspondingly improved, and the product can not turn yellow for a long time to form a surface with no flaws on the mirror surface. In addition, the water-based bi-component bright white paint is a green environment-friendly coating product with low VOC content.

Detailed Description

The disclosure may be understood more readily by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.

The term "prepared from …" as used herein is synonymous with "including". As used herein, the terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

The conjunction "consisting of …" excludes any unspecified elements, steps or components. If used in a claim, the phrase will render the claim closed except for the materials described, except for the conventional impurities associated therewith. When the phrase "consisting of …" appears in a clause of the subject matter of the claims rather than immediately after the subject matter, it defines only the elements described in the clause; other elements are not excluded from the claims as a whole.

When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.

The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. "optional" or "any" means that the subsequently described event or events may or may not occur, and that the description includes instances where the event occurs and instances where it does not.

Approximating language, as used herein in the specification and claims, is intended to modify a quantity, such that the invention is not limited to the specific quantity, but includes portions that are literally received by modifying or otherwise modifying such quantity without substantially changing the basic function to which it is related. Accordingly, the use of "about" to modify a numerical value means that the invention is not limited to the precise value. In some instances, the approximating language may correspond to the precision of an instrument for measuring the value. In the present description and claims, range limitations may be combined and/or interchanged, including all sub-ranges contained therein if not otherwise stated.

In addition, the indefinite articles "a" and "an" preceding an element or component of the invention are not intended to limit the number requirement (i.e., the number of occurrences) of the element or component. Thus, "a" or "an" should be read to include one or at least one, and the singular form of an element or component also includes the plural unless the stated number clearly indicates that the singular form is intended.

The invention provides a water-based two-component bright white paint with excellent comprehensive performance, which is prepared from the following components in parts by weight (2.5-4): 1, wherein the component A comprises the following raw materials in parts by weight: 50-60 parts of aqueous hydroxyl acrylic emulsion, 5-15 parts of water, 25-35 parts of titanium white slurry, 1-5 parts of high-density polyethylene wax emulsion, 1-3 parts of auxiliary agent, 0.1-0.2 part of ammonia neutralizer, 2-5 parts of dipropylene glycol butyl ether, 0.05-0.1 part of in-tank bactericide and 0.1-2 parts of thickening agent; the hydroxyl value of the water-based hydroxyl acrylate emulsion is 2.5-3.5, and the solid content is 60-80%; the component B is water-based silicon-based polyisocyanate.

Aqueous hydroxy acrylic emulsion

The aqueous hydroxy acrylic emulsion is synthesized by adopting an emulsion polymerization process, is environment-friendly and low in price, has a simple and easily controlled synthesis process, and is beneficial to industrial production.

In one embodiment, the aqueous hydroxy acrylate emulsion has a hydroxyl number of 3.0 and a solids content of 70%.

In one embodiment, the method of making the aqueous acrylic emulsion comprises the steps of:

a. dissolving 1.5-2.5 parts by weight of emulsifier and 0.1-0.3 part by weight of sodium bicarbonate in 40-50 parts by weight of deionized water, adding 60-80 parts by weight of monomer after the emulsifier is completely dissolved, and fully stirring at 200-300rpm for 20-30min to obtain pre-emulsion;

b. dissolving 0.3-0.7 part by weight of ammonium persulfate in 10-40 parts by weight of deionized water, and uniformly stirring to obtain an ammonium persulfate aqueous solution;

c. weighing 10-15% of pre-emulsion and 30-40 parts of deionized water by mass percent, stirring and heating to 75-85 ℃ at the rotating speed of 100-150rpm, adding 30-50% of ammonium persulfate aqueous solution by volume percent, and continuously reacting for 0.5-1h at the temperature to obtain blue-phase seed emulsion;

d. simultaneously dripping the rest of pre-emulsion and ammonium persulfate aqueous solution into the blue-phase seed emulsion, controlling the dripping speed, and finishing the dripping within 2-4 h; after the dropwise addition of the raw materials is finished, heating, and continuously carrying out heat preservation reaction for 1-2h at the temperature of 85-90 ℃; and then cooling to 40-50 ℃, adjusting the pH to 7-8 by using dimethylethanolamine, uniformly stirring, filtering and discharging to obtain the product.

In a preferred embodiment, the method for preparing the aqueous acrylic emulsion comprises the following steps:

a. dissolving 2 parts by weight of fatty alcohol-polyoxyethylene ether ammonium sulfate and 0.2 part by weight of sodium bicarbonate in 45 parts of deionized water, adding 70 parts of monomer after the fatty alcohol-polyoxyethylene ether ammonium sulfate is completely dissolved, and fully stirring at 250rpm for 30min to obtain a pre-emulsion;

b. dissolving 0.5 part by weight of ammonium persulfate in 30 parts by weight of deionized water, and uniformly stirring to obtain an ammonium persulfate aqueous solution;

c. weighing 12% by mass of pre-emulsion and 35 parts of deionized water, stirring and heating to 80 ℃ at the rotating speed of 200rpm, adding 50% by volume of ammonium persulfate aqueous solution, and continuously reacting for 1.5h at the temperature to obtain blue-phase seed emulsion;

d. simultaneously dripping the rest of pre-emulsion and ammonium persulfate aqueous solution into the blue-phase seed emulsion, controlling the dripping speed, and finishing the dripping within 3 h; after the dropwise addition of the raw materials is finished, heating, and continuously carrying out heat preservation reaction for 2 hours at the temperature of 90 ℃; and then cooling to 45 ℃, adjusting the pH to 7.5 by using dimethylethanolamine, stirring uniformly, filtering and discharging to obtain the product.

In a preferred embodiment, the emulsifier is ammonium fatty alcohol polyoxyethylene ether sulfate and/or sodium fatty alcohol polyoxyethylene ether sulfate.

In a preferred embodiment, the emulsifier is fatty alcohol polyoxyethylene ether ammonium sulfate.

In a preferred embodiment, the monomers include methyl methacrylate, n-butyl acrylate, hydroxyethyl methacrylate, methacrylic acid.

In a preferred embodiment, the mass ratio of n-butyl acrylate, methacrylic acid, methyl methacrylate and hydroxyethyl methacrylate is (2-5): (1-3): 1: (0.1-0.7).

In a preferred embodiment, the mass ratio of n-butyl acrylate, methacrylic acid, methyl methacrylate and hydroxyethyl methacrylate is 3: 2: 1: 0.4.

examples n-butyl acrylate, methacrylic acid, methyl methacrylate, hydroxyethyl methacrylate were all purchased from Shanghai friendship acrylic acid, Inc.; in the examples, sodium fatty alcohol polyoxyalkylene ether sulfate (CAS: 9004-82-4) was purchased from Kachen chemical Co., Ltd.

Titanium white slurry

The titanium white slurry has high pigment content and strong tinting strength; the gloss, the hardness and the drying time of a paint film are not influenced; alcohol solvent resistance, high temperature resistance and migration resistance; the modified acrylic resin has good compatibility with waterborne acrylic acid, waterborne polyurethane, waterborne epoxy resin, waterborne amino resin and the like; safe and environment-friendly, low VOC and no APEO.

In a preferred embodiment, the mass percentage of rutile titanium dioxide in the titanium dioxide slurry is 65-75%.

In a preferred embodiment, the mass percentage of rutile titanium dioxide in the titanium dioxide slurry is 70%.

In a preferred embodiment, the method for preparing the titanium white slurry comprises the following steps: mixing the following components in percentage by weight of 60: 1.25: 1: 8, uniformly mixing the deionized water, the dispersant, the defoamer and the thickener at 800r/min under 600-800 ℃, adding 70 weight percent of rutile titanium dioxide while stirring, stirring for 10-15min under the stirring condition of 1200r/min under 800-1200r/min, and grinding to the fineness of less than 15 mu m by using a grinder to obtain the titanium dioxide slurry.

The rutile titanium dioxide is purchased from Zhengzhou polyester chemical products Co.

High density polyethylene wax emulsion

The high-density polyethylene wax emulsion disclosed by the invention is resistant to acid, alkali and hard water, strong in water solubility, stable in emulsion, free of layering, demulsification and agglomeration after being diluted by water in any proportion, long in quality guarantee period, high in solid content and good in dispersibility, and has good performances of scratch resistance, water resistance, adhesion and pollution resistance, wear resistance, softness, surface lubrication and the like.

In the examples, the high-density polyethylene wax emulsion is purchased from Longkou Kaishu chemical technology Co., Ltd, and the brand is TL-2011A.

Auxiliary agent

The auxiliary agent is also called auxiliary material, and can improve the performance of the coating and promote the formation of a coating film. The paint is prepared from various raw materials including a drier, a flexibilizer, an emulsifier, a thickener, a pigment dispersant, a defoaming agent, a leveling agent, an anti-skinning agent, a flatting agent, a light stabilizer, a mildew preventive, an antistatic agent and the like.

In one embodiment, the auxiliary agent comprises a defoaming agent, a wetting agent, a dispersing agent and a leveling agent.

In a preferred embodiment, the weight percentages of the components in the auxiliary agent are as follows: 23-30% of defoaming agent, 18-28% of wetting agent, 13-25% of dispersing agent and the balance of leveling agent.

In a preferred embodiment, the weight percentages of the components in the auxiliary agent are as follows: 30% of defoaming agent, 20% of wetting agent, 25% of dispersing agent and the balance of leveling agent.

In a preferred embodiment, the defoaming agent is one or more of an aqueous non-silicone fatty acid polymer, a modified polyacrylic acid polymer, a polyoxyethylene ether and a modified polysiloxane; the dispersant is a copolymer and/or a high molecular block copolymer containing pigment affinity groups; the leveling agent is polyether modified polysiloxane and/or polyester modified polysiloxane.

In a preferred embodiment, the defoamer is a BYK-024 defoamer; the dispersant is a BYK-163 dispersant; the wetting agent is BYK346 wetting agent; the leveling agent is a BYK-360 leveling agent.

In the examples, the defoamer, wetting agent, dispersant, and leveling agent were purchased from Guangzhou Baohua trade company, Inc.

Ammonia neutralizer

The ammonia neutralizer is an AMP-95 ammonia neutralizer of DOW.

In-tank bactericide

The in-tank bactericide of the invention is an environment-friendly in-tank bactericide of DOW, and the brand is KATHONLXE.

Thickening agent

The thickening agent can improve the viscosity of a system, so that the system is kept in a uniform and stable suspension state or an emulsion state, and most thickening agents have an emulsifying effect.

The thickener of the present invention is polyurethane thickener PUR62 from Ming Rabdosia.

Aqueous silicon-based polyisocyanates

The waterborne silicon-based polyisocyanate is a curing agent which is obtained by carrying out hydrophilic modification on aliphatic polyisocyanate to obtain good performance.

In one embodiment, the raw materials for preparing the waterborne silicon-based aliphatic polyisocyanate comprise a hydrophilic modifier, aliphatic polyisocyanate and organosilicon.

In a preferred embodiment, the mass ratio of the hydrophilic modifier to the aliphatic polyisocyanate to the silicone is 1: 1: (1-3).

In a preferred embodiment, the mass ratio of the hydrophilic modifier to the aliphatic polyisocyanate to the silicone is 1: 1: 2.

in a preferred embodiment, the hydrophilic modifier is selected from one or more of 3- (cyclohexylamine) -1-propanesulfonic acid, 2-cyclohexylaminoethanesulfonic acid, N- (3-triethoxysilylpropyl) -4-hydroxybutyramide, and sodium N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonate.

In a preferred embodiment, the hydrophilic modifier is sodium N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonate.

In a preferred embodiment, the aliphatic polyisocyanate is selected from one or more of isophorone diisocyanate, 1, 6-hexamethylene diisocyanate, dicyclohexylmethane-4, 4' -diisocyanate.

In a preferred embodiment, the aliphatic polyisocyanate is selected from isophorone diisocyanate.

In a preferred embodiment, the silicone is one or more of polymethylvinyl silicone resin, polymethylphenyl silicone resin and polyethyl silicone resin.

In a preferred embodiment, the silicone is polymethylphenyl silicone.

In the examples, the polymethylphenylsilicone resin was purchased from New Sihai chemical Co., Ltd, Hubei under the trade name SH-9602.

The inventor finds that the waterborne two-component bright white paint prepared by adopting the components has excellent comprehensive performance through long-term experimental research. The probable reasons are that the acrylic emulsion with high hydroxyl and high solid content is selected, so that the reaction density of a paint film is greatly improved, molecular chain crosslinking is sufficient, and the hardness of the paint film is increased; meanwhile, the hydroxyl value is increased, the crosslinking speed is accelerated, the surface drying time of the coating is shortened, and the coating is easy to polish, so that the glossiness of the paint film is enhanced; in addition, the modified aliphatic polyisocyanate curing agent with good yellowing resistance is reasonably selected, and the modified aliphatic polyisocyanate curing agent has extremely high NCO content, so that the hardness and the gloss of a paint film are improved.

Examples

In order to better understand the above technical solutions, the following detailed descriptions will be provided with reference to specific embodiments. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above disclosure are still within the scope of the present invention. In addition, the starting materials used are all commercially available, unless otherwise specified.

Example 1

Example 1 provides a waterborne two-component gloss white paint with excellent overall performance, which is prepared from (by weight ratio) 3.25: 1, wherein the component A comprises the following raw materials in parts by weight: 55 parts of aqueous hydroxy acrylic emulsion, 10 parts of deionized water, 30 parts of titanium white slurry, 3 parts of high-density polyethylene wax emulsion, 2 parts of an auxiliary agent, 0.15 part of an ammonia neutralizing agent, 3.5 parts of dipropylene glycol butyl ether, 0.07 part of a bactericide in a tank and 1 part of a thickening agent; the hydroxyl value of the aqueous hydroxyl acrylate emulsion is 3.0, and the solid content is 70%; the component B is water-based silicon-based aliphatic polyisocyanate.

The preparation method of the water-based hydroxyl acrylic emulsion comprises the following steps:

The monomers include methyl methacrylate, n-butyl acrylate, hydroxyethyl methacrylate and methacrylic acid.

The mass ratio of the n-butyl acrylate to the methacrylic acid to the methyl methacrylate to the hydroxyethyl methacrylate is 3: 2: 1: 0.4.

the preparation method of the titanium white slurry comprises the following steps: mixing the following components in percentage by weight of 60: 1.25: 1: 8, uniformly mixing the deionized water, the dispersing agent, the defoaming agent and the thickening agent at a stirring speed of 700r/min, adding 75 wt% of rutile titanium dioxide while stirring, stirring for 13min under the stirring condition of 1000r/min, and grinding to the fineness of 13 mu m by using a grinder to obtain titanium white slurry;

the high-density polyethylene wax emulsion is available from Longkou Kaiyu Kaishu chemical technology Co.

The auxiliary agent comprises a defoaming agent, a wetting agent, a dispersing agent and a flatting agent.

The auxiliary agent comprises the following components in percentage by weight: 30% of defoaming agent, 20% of wetting agent, 25% of dispersing agent and the balance of leveling agent.

The defoaming agent is a BYK-024 defoaming agent; the dispersant is a BYK-163 dispersant; the wetting agent is BYK346 wetting agent; the leveling agent is a BYK-360 leveling agent.

The ammonia neutralizer is an AMP-95 ammonia neutralizer of DOW.

The in-tank bactericide is an environment-friendly in-tank bactericide of DOW, and the brand is KATHON LXE.

The thickener was polyurethane thickener PUR62 from minling corporation.

The raw materials for preparing the waterborne silicon-based aliphatic polyisocyanate comprise a hydrophilic modifier, aliphatic polyisocyanate and organic silicon.

The mass ratio of the hydrophilic modifier to the aliphatic polyisocyanate to the organosilicon is 1: 1: 2.

the hydrophilic modifier is N, N-di (2-hydroxyethyl) -2-aminoethanesulfonic acid sodium salt.

The aliphatic polyisocyanate is isophorone diisocyanate.

The organic silicon is polymethylphenyl silicone resin.

The polymethyl phenyl silicone resin is SH-9602.

The preparation method of the water-based bi-component bright white paint with excellent comprehensive performance comprises the following steps:

s1 preparation of component A: dispersing the aqueous hydroxyl acrylic emulsion and the auxiliary agent at the rotating speed of 1300rpm until the fineness is less than or equal to 25 mu m, then adding dipropylene glycol butyl ether mixed with water in advance, adding titanium white slurry, in-tank bactericide, high-density polyethylene wax emulsion and thickening agent, and uniformly stirring to obtain a component A;

s2 preparation of component B: reacting N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid sodium salt with polymethylphenyl silicone resin at 70 ℃ to obtain a hydrophilic silicon-based modifier; under the protection of nitrogen, continuously reacting isophorone diisocyanate and tri-n-butylphosphine at 60 ℃ for 4 hours to obtain synthetic isophorone diisocyanate trimer; and then adding a hydrophilic silicon-based modifier, heating to 70 ℃, reacting for 2.5h, cooling, and discharging to obtain a component B.

The using method of the water-based two-component bright white paint with excellent comprehensive performance comprises the following steps: stirring and emulsifying the component B and water, adding the emulsified component B into the component A, stirring uniformly, curing for 10min, and coating the mixture on a workpiece.

Example 2

The embodiment 2 is basically the same as the embodiment 1, except that the component A comprises the following raw materials in parts by weight: 50 parts of aqueous hydroxy acrylic emulsion, 5 parts of deionized water, 25 parts of titanium white slurry, 1 part of high-density polyethylene wax emulsion, 1 part of auxiliary agent, 0.1 part of ammonia neutralizer, 2 parts of dipropylene glycol butyl ether, 0.05 part of in-tank bactericide and 0.1 part of thickening agent.

Example 3

Example 3 is substantially the same as example 1 except that the component A comprises the following raw materials in parts by weight: 60 parts of aqueous hydroxy acrylic emulsion, 15 parts of deionized water, 35 parts of titanium white slurry, 5 parts of high-density polyethylene wax emulsion, 3 parts of an auxiliary agent, 0.2 part of an ammonia neutralizing agent, 5 parts of dipropylene glycol butyl ether, 0.1 part of a bactericide in a tank and 2 parts of a thickening agent.

Comparative example 1

Comparative example 1 is essentially the same as example 1 except that the b component is isophorone diisocyanate.

Comparative example 2

Comparative example 2 is essentially the same as example 1 except that the b component is modified isophorone diisocyanate.

The preparation method of the modified aliphatic polyisocyanate comprises the following steps: under the protection of nitrogen, continuously reacting isophorone diisocyanate and tri-n-butylphosphine at 60 ℃ for 4h to obtain isophorone diisocyanate trimer; and then adding 3- (cyclohexylamine) -1-propanesulfonic acid, heating to 70 ℃, reacting for 2.5h, cooling and discharging to obtain the catalyst.

Evaluation of Performance

The indexes and performances of the water-based double-component bright white paint obtained in the examples and the comparative examples are detected according to the standard of 23999-2009 water-based wood paint for interior decoration.

TABLE 1 Performance data for the aqueous two-component gloss white paint obtained in example 1

TABLE 2 Performance data of aqueous two-component gloss white paints prepared in the examples and comparative examples

Item	Example 1	Example 2	Example 3	Comparative example 1	Comparative example 2
						Gloss (60 degree)%	95	93	93	80.2	86.3
Hardness of	2H	2H	2H	HB	H

Claims

1. The water-based two-component bright white paint with excellent comprehensive performance is characterized by comprising the following components in percentage by weight (2.5-4): 1, wherein the component A comprises the following raw materials in parts by weight: 50-60 parts of aqueous hydroxyl acrylic emulsion, 5-15 parts of water, 25-35 parts of titanium white slurry, 1-5 parts of high-density polyethylene wax emulsion, 1-3 parts of auxiliary agent, 0.1-0.2 part of ammonia neutralizer, 2-5 parts of dipropylene glycol butyl ether, 0.05-0.1 part of in-tank bactericide and 0.1-2 parts of thickening agent; the hydroxyl value of the water-based hydroxyl acrylate emulsion is 2.5-3.5, and the solid content is 60-80%; the component B is water-based silicon-based aliphatic polyisocyanate.

2. The waterborne two-component gloss white paint with excellent comprehensive performance of claim 1, wherein the raw materials for preparing the waterborne silicon-based aliphatic polyisocyanate comprise a hydrophilic modifier, aliphatic polyisocyanate and organosilicon.

3. The waterborne two-component gloss white paint with excellent comprehensive performance according to claim 2, characterized in that the hydrophilic modifier is selected from one or more of 3- (cyclohexylamine) -1-propanesulfonic acid, 2-cyclohexylaminoethanesulfonic acid, N- (3-triethoxysilylpropyl) -4-hydroxybutyramide, and N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid sodium salt.

4. The waterborne two-component gloss white paint with excellent comprehensive performance according to claim 2, characterized in that the aliphatic polyisocyanate is selected from one or more of isophorone diisocyanate, 1, 6-hexamethylene diisocyanate, dicyclohexylmethane-4, 4' -diisocyanate.

5. The waterborne two-component gloss white paint with excellent comprehensive properties according to claim 1, wherein the waterborne hydroxyl acrylate emulsion has a hydroxyl value of 3.0 and a solid content of 70%.

6. The waterborne two-component glossy white paint with excellent comprehensive performance according to claim 1, wherein the mass percent of rutile type titanium dioxide in the titanium white slurry is 65-75%.

7. The waterborne two-component bright white paint with excellent comprehensive performance of claim 1, wherein the auxiliary agent comprises a defoaming agent, a wetting agent, a dispersing agent and a leveling agent; the auxiliary agent comprises the following components in percentage by weight: 23-30% of defoaming agent, 18-28% of wetting agent, 13-25% of dispersing agent and the balance of leveling agent.

8. The waterborne two-component gloss white paint with excellent comprehensive performance of claim 1, wherein the defoaming agent is one or more of waterborne non-silicone fatty acid polymer, modified polyacrylic acid polymer, polyoxyethylene ether and modified polysiloxane; the dispersant is a copolymer and/or a high molecular block copolymer containing pigment affinity groups; the leveling agent is polyether modified polysiloxane and/or polyester modified polysiloxane.

9. A method for preparing a waterborne two-component gloss white paint with excellent combination of properties according to any one of claims 2-8, comprising the steps of:

10. A method for using the water-based two-component bright white paint with excellent comprehensive performance according to any one of claims 1 to 8, which is characterized by comprising the following steps: stirring and emulsifying the component B and water, adding the emulsified component B into the component A, stirring uniformly, curing for 5-10min, and coating the mixture on a workpiece.